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ANALISIS HASIL PENETAPAN BATAS DESA DI KABUPATEN GUNUNGKIDUL PROVINSI DAERAH ISTIMEWA YOGYAKARTA Sutanta, Heri; Pratiwi, Imasti Dhani; Atunggal, Dedi; Cahyono, Bambang Kun; Diyono, Diyono
GEOMATIKA Vol 26, No 2 (2020)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24895/JIG.2020.26-2.1163

Batas administrasi desa memiliki peran yang sangat penting dalam berbagai kegiatan pemerintahan. Batas desa di Kabupaten Gunungkidul didelineasi ulang pada tahun 2018 melalui kegiatan yang difasilitasi oleh Dinas Pertanahan dan Tata Ruang Provinsi Daerah Istimewa Yogyakarta. Acuan utama untuk membuat Peta Kerja Batas adalah Peta Desa Lama skala 1:5.000 yang dibuat antara tahun 1932-1938. Batas desa pada Peta Desa Lama tersebut diinterpretasi dan didigitasi di Citra Tegak Resolusi Tinggi dari Badan Informasi Geospasial. Penelitian ini menganalisis perbedaan batas dalam hal karaksteristik segmen batas, pergeseran segmen batas, dan perubahan luas wilayah. Terdapat perubahan karakteristik segmen batas yang berupa titik temu, segmen berbatasan dan segmen tidak berbatasan. Pergeseran posisi segmen batas yang terjadi sampai 1.773 m pada Peta RBI, dan 997 m pada hasil identifikasi peta desa lama. Luas wilayah Kabupaten Gunungkidul mengalami penurunan dibandingkan dengan luas menurut Peta RBI sebesar 287,79 hektar, dan 269,22 hektar jika dibandingkan dengan data BPS. Dalam hal luas wilayah desa terdapat 71 desa mengalami penambahan luas wilayah dibandingkan dengan Peta RBI dan 67 desa jika dibandingkan dengan data BPS. Perbedaan sumber data, skala, dan metode pembuatan batas di Peta RBI dan hasil kesepakatan menghasilkan perbedaan karakteristik batas, posisi garis batas, dan luas wilayah. Berdasarkan hasil ini, batas desa definitif perlu disegerakan penyediaannya untuk menggantikan jenis batas lain yang terpaksa digunakan.

Perhitungan Kecepatan Sedimentasi Melalui Pendekatan Usle dan Pengukuran Kandungan Tanah dalam Air Sungai yang Masuk ke dalam Waduk Sermo Bambang Kun Cahyono; Lukman Hakim; Waljiyanto Waljiyanto; Agus Darmawan Adhi
Jurnal Nasional Teknologi Terapan (JNTT) Vol 1, No 1 (2017): NOVEMBER
Publisher : Penelitian dan Pengabdian Kepada Masyarakat Sekolah Vokasi Universitas Gadjah Mada

Dam is one of the essential man-made buildings which was developed to various beneficialy purposes such as irrigation, fresh water supply, flooding and drying control, and also tourism. Due to those mentioned functions, condition of the dam has to be maintained continuously especially from sedimentation. Sedimentation is being a serious threat for the continuity of dam services. Protecting dam from sedimentation is not only managing dam area, but also we have to care all watershed area, because the sedimentation is caused by erotion on the area. In order to know the rate of the sedimentation within the dam, measurement and prediction must be done. One of methods to predict and measure the sedimentation is by analyzing geospatial data using USLE Approach, and analyzing suspended sediment in river’s water toward to the dam. By those both analysis, rate of sedimentation happened within the dam can be calculated. This paper try to use geospatial (GIS) based analysis to estimate the sedimentation rate using USLE approach within Ngrancah Watershed. The USLE Formula requires four types of maps, they are soil type, slope, land cover, and rain erosivity maps. Each of maps is classified to the specific standards, then will be analized by overlaying to another map. Another method will be used to estimate these dimentation rate is the suspended sediment measurement. This method was determined using sediment transport formula. The data used are samples of river water ing Ngerancah Watershed that was flow toward to the Sermo Dam, and daily volume of inflow water. Those resulted values, then were compared each other. Based on the calculation, sedimentation rate resulted using USLE Approach is 276.100,917 m3 per year or 8,675 mm thickness per year. While the calculation based on the measurement of suspended sediment in river’s water is 270.206,363 m3 per year or 8,490 mm thickness per year. The difference value between the both methods is 5894,555 m3 per year or 0,185 mm thickness per year. Based on the watershed monitoring guidelines published by The Ministry of Forestry of Indoensia, the Sermo Dam sedimentation rate is categorized in poor class, because the sedimentation rate is exceeding 5 mm per year, as the safe limit of dam sedimentation rate.

3D Modeling and Volume Estimation of Riverbed Layers Based on Sub Bottom Profiler Measurement Data Nurkhalis Rahili Rahili; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 2, No 1 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.39974

The river is one of the transportation routes for human beings, as well as the pipelines for oil and gas distribution, or as power cable lines and communications networks. In order to not disturb the pipe or cable due to the activity of the ship through the river, it is necessary to study the sediment from the river. This study aims to determine the type of sediment, the thickness of the sediment, the depth of sediment, and volume of the sediment itself. It can be done with acoustic measurements.The measurement of the acoustic survey in this activity uses a sub bottom profiler Strata Box HD type Chirp. By using this tool, it can obtain sediment layer up to a certain depth. The result of the measurement will be interpreted to obtain the travel time of the acoustic wave as it reflected on the sediment layer. The travel time than processed and corrected with the tidal measurement data which made over 14 days to obtain the actual depth value from the result with the sub bottom profiler. The depth data then were quality tested based on reference IHO SP-44 2008 at order 1a.This activity produces a 3D model of river layer, depth profile and sediment layer volume estimation. The result of the quality tested obtained corrected depth data has met the established standards of order 1a IHO SP-44 2008. Using a 95% confidence level, the test results in the first layer is 0.271 m with an error tolerance at 0.510 m. For the second layer has a data quality test results 0.491 m with a tolerance at 0.521 m. The result of depth profile is a long section and cross section. The long section indicates that in the deflection of the river area there is a steep decline compared to the area before and after the river deflection. In addition, the river deflection area has a thinner sedimentary layer. The volume estimation of sediment layers obtained in the area of the activity is 4932752.739 m3.

The Updating of the Nautical Chart Number 69 on Java Sea Area for Safety Navigation of Sailing Dwi Septri Hastuti; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 1, No 2 (2018): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.40086

Indonesia is the largest archipelagic country in the world that has become one of the main routes in international marine trade by contributing 40% of all international marine trade routes. The importance of waterways in international trading demands the existence of nautical chart for navigation. Time after time, the sea changes, therefore nautical chart needs to be update especially on the area that has a high marine traffic density such as Java Sea which currently has developed an electronic map for navigation, however paper charts are still needed for planning shipping line, the navigation on small boats and backup of charts on large ships. The aim to be achieved from this research is the availability of the latest paper chart which is appropriate with IHO standard S-4, INT1 (symbols, abbreviations and terms used on charts), INT2 (the boundary lines, gradient, grid and linear scale) and Chart Number 1. Updating chart number 69 was created by using data Electronic Navigation Chart (ENC) Northen part of Central Java region, data raster paper chart number 69 the ninth edition of the second expenditure, survey data 2017 in Cirebon and the Eastern part of Java Sea and Indonesian Notice to Mariners number 11-29 year 2017. Data obtained from the Pusat Hidrografi dan Oseanografi TNI-AL. The software used in production of nautical chart is Paper Chart Composer (PCC). Then it was added the updated data and information to the chart. The result of production a chart were corrected using digital and manual quality control analysis to eliminate errors in the process of production chart. As a result of updating nautical chart number 69 is that some of the objects that had been corrected have errors so it needs to be repaired until no more errors occur. The updating paper chart was already matched to standard IHO S-4 and INT1. The visualization of paper chart in accordance with the standard IHO INT2 and Chart number 1. The avaibility of paper chart number 69 with the update of data on the area of the Java Sea has been accomplished and can be used by mariner to navigation.

Development and Definition of Prambanan Temple Deformation Monitoring Control Points Rochmad Muryamto; Muhammad Iqbal Taftazani; Yulaikhah Yulaikhah; Bambang Kun Cahyono; Anindya Sricandra Prasidya
Jurnal Geospasial Indonesia Vol 1, No 2 (2018): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.40788

Since 1991, Prambanan Temple has been recognized by UNESCO as a cultural heritage of a historic building. In its construction, the Prambanan temple was established in a labile soil structure in the sandy soil and not far from the Opak River. In the geological map of Yogyakarta, there is a fault under the Opak River landscape. This fault under the Opak River has caused an earthquake in 2006. Because of its position in disaster-prone areas, regular monitoring of the geometric aspects of Prambanan Temple is very necessary.This research aims to build a deformation monitoring control point in Prambanan Temple. Eight control points, consist of three existing points and five new points are built around Prambanan Temple. These eight control points then were measured by observing GNSS for 1x24 hours in order to define their coordinates. GNSS data processing is done using GAMIT 10.70 software with two strategies, namely (1) processing with regional binding points, in this case using IGS BAKO and JOG2 stations, and (2) processing with global binding points using IGS COCO station reference points, DARW, KARR, POHN, PIMO, DGAR, and IISC. This research yields the establishment of Prambanan temple deformation control points and their coordinates and standard deviation in two processing strategies. The smallest standard deviation in the first strategy is 0.0787 m on the Z-axis for points of PRO1 and PR03. The biggest standard deviation is 0.1218 m on the Y-axis at point of PR02. In the second strategy the smallest standard deviation is 0.0036 m on the Z-axis for points of PR01 and PR03. The biggest standard is 0.0141 m on the Y-axis at point of PR02.

Calculation Of Sedimentation Rate at Sempor Reservoirs in 2018 Using Modified Universal Soil Loss Equation Method (MUSLE) Septi Arini; Yulaikhah Yulaikhah; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 2, No 2 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.51156

Sempor Reservoir located in the Telomoyo River Basin in the Serayu River region is categorized as one of the priority watersheds based on the 2015-2019 Strategic Plan of the Ministry of Environment and Forestry. Priority watershed is a watershed that gets more attention in controlling water pollution, one of which is sedimentation. Watershed observation and management activities are needed for the reservoir to operate optimally. One of the observations and management activities of the Sempor Watershed is the calculation of sedimentation rate. In this research the sedimentation rate was calculated using the MUSLE method that included runoff parameter, erodibility, slope, land cover and conservation factor. The Sempor watershed boundary is obtained through delineation of DEM. The calculation is done by utilizing a Geographic Information System (GIS) through analysis of soil type maps, length and slope maps, land cover and conservation maps with the boundaries of the Sempor Reservoir. Based on this result, the Sempor Reservoir has a sedimentation rate of 166,173,500 tons/year and a sedimentation thickness rate of 3,7259 mm/year. According to the provisions of the Ministry of Forestry in 2009, the rate of sedimentation thickness in the Sempor Reservoir is included in the medium class. The river as one of the potential means of sediment transport contributes to the rate of sediment thickness of 3.7256 mm /year, while for areas outside the river coverage it only 0.003 mm/year. The river has a major influence on sedimentation in the Sempor Reservoir.

Estimasi Volume Sedimentasi Waduk Sermo Menggunakan Metode RUSLE, Batimetri dan Angkutan Sedimen Annisa Wulandari; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 3, No 1 (2020): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.53719

Sermo Reservoir is a reservoir which was built by Indonesian Government and supported by Asian Development Bank in program Integrated Irrigation Sector Project (IISP) in 1996. Sermo Reservoir functions as a flood control, raw water source and irrigation. Changes that occur to water catchment area of the Sermo Reservoir affects its condition. Especially changes that occur in aspects of water runoff, sediment production and watershed deposition of watershed aspects which are caused by erosion in water catchment area resulting in sedimentation. Long term sedimentation causes a decrease in reservoir capacity. To overcome this problem it is necessary to estimate the sedimentation volume to determine the latest condition of the Sermo Reservoir. In this activity, volume estimation of sedimentation was conducted using RUSLE, bathymetry and sediment transport methods. The data used in this activity are the data in 2016, 2017 and 2018. In this activity, the analysis of the RUSLE method in the Ngrancah Watershed includes the factors of rainfall erosivity, soil erodibility, length and slope and land cover and preservation. In addition to RUSLE, an analysis was carried out using the bathymetry method. This method calculates sedimentation based on reservoir baseline DTM data of 2017 and 2018. From the difference between both DTM epochs, obtained sediment volume and spread of Sermo Reservoir. Besides, analysis of the sediment transport method was conducted using water soil content data of 2016 which is assumed static until 2018. While analyzing with RUSLE, bathymetry and sediment transport methods using ArcGIS Software. The results of volume estimation of sedimentation using RUSLE, sediment transport and bathymetry consecutively yields 184.158,580 m3/year, 163.151,173 m3/year and 149.959,800 m3/year. Thus the estimation results of sediment thickness velocity of Sermo Reservoir using RUSLE, bathymetry and sediment transport are 8,687 mm/year, 7,790 mm/year and 7,074 mm/year. Generated volume from the methods was tested by using precision test yielding RSD 8,407 % thus classified as low accuracy. From the precision test can be concluded that sediment transport was the most precise because it has a percentage difference of -0,766 % of the average sediment volume.

Klasifikasi Jenis dan Sebaran Sedimen Menggunakan Data Multibeam Echosounder Multi-Temporal di Alur Pelayaran Barat dan Timur Surabaya Fadilla Ivana Ayuningtyas; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 4, No 2 (2021): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.62741

Pelabuhan Tanjung Perak Surabaya merupakan salah satu pelabuhan utama di Indonesia yang memiliki peran penting dalam transportasi laut Indonesia. Survei batimetri rutin diperlukan untuk mengidentifikasi kedalaman alur akses pelabuhan dan kondisi sedimentasi yang terjadi. Kondisi sedimen dapat dikarakterisasi berdasarkan sifat alaminya: ukuran butir, berat jenis, kecepatan jatuh, komposisi, porositas, bentuk, dll. Kondisi sedimen juga dapat dikarakterisasi berdasarkan nilai hamburan balik sonar, menggunakan instrumen Multibeam Echosounder (MBES) . Data mentah nilai hamburan balik kemudian dikoreksi dengan mengadopsi persamaan regangan kontras linier ke kisaran tertentu. Data masukan penelitian ini diukur menggunakan ODOM MB2 dengan instrumen Applanix oleh The Surabaya Navigational District (DISNAV) pada bulan Februari 2019 (Lokasi 2) dan Oktober 2018 (Lokasi 1) untuk alur akses barat Surabaya (APBS) dan Agustus 2017 ( Lokasi 3) untuk jalur akses timur Surabaya (APTS). Uji kualitas data batimetri dilakukan dengan mengikuti IHO S-44 2008 untuk spesifikasi pesanan khusus. Hasil penelitian menunjukkan bahwa data batimetri memiliki akurasi yang baik pada lokasi 1, 2, dan 3 dengan nilai 0,0862; 0,1317; dan 0,1072. Hubungan antara tipe sedimen dan hamburan balik menunjukkan bahwa tipe sedimen pasir memberikan hamburan balik yang kuat. Semakin kecil nilai hamburan balik maka jenis sedimennya semakin lunak. Klasifikasi di APBS dan APTS menunjukkan bahwa di APBS terdiri dari empat jenis sedimen (lempung, lanau lempung, lanau berpasir, dan pasir) sedangkan di APTS hanya terdapat tiga jenis sedimen (lanau lempung, lanau berpasir, dan pasir).

Pemodelan 3D Lapisan Dasar Laut Dan Identifikasi Ketebalan Sedimen Berdasarkan Kombinasi Data Pengukuran Sub-Bottom Profiler Dan Single Beam Echosounder (Studi Kasus: Alur Akses Timur Surabaya) Windy Hapsari; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 4, No 2 (2021): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.63756

Pelabuhan merupakan salah satu fasilitas umum yang memiliki peran penting dalam keselamatan navigasi pelayaran. Shipping yang aman harus didukung dengan pemantauan dan pemeliharaan secara berkala untuk mendapatkan informasi terkini tentang kedalaman, dasar laut, dan sedimentasi. Jika sedimentasi terakumulasi secara terus menerus dalam waktu singkat di alur akses (jalur pelayaran), maka dapat meningkatkan kemungkinan terjadinya kecelakaan kapal. Kajian ini mencoba memetakan dan menganalisis kondisi batimetri dan sedimentasi untuk mendukung pemantauan dan pemeliharaan rutin alur akses Timur Pelabuhan Tanjung Perak Surabaya. Metode yang digunakan dalam penelitian ini adalah survei akustik berdasarkan data pengukuran Sub-Bottom Profiler (SBP) dan Single Beam Echosounder (SBES). Data yang diperoleh kemudian dikoreksi oleh Sound Velocity Profiler (SVP), data pasang surut, dan draft transduser. Kualitas data kemudian diuji berdasarkan IHO SP-44 2008 dan uji t-studentized dengan tingkat kepercayaan 95%. Hasil dari penelitian ini adalah model 3 dimensi, profil kedalaman, ketebalan, dan volume lapisan sedimen dasar laut. Hasil penelitian menunjukkan bahwa alur akses Timur Surabaya memiliki empat lapisan dasar laut yaitu permukaan dan tiga lapisan sedimen di bawahnya. Kedalaman lapisan bervariasi antara 3 m sampai 16,8 m. Kualitas data kedalaman lapisan atas dikontrol oleh IHO S-44 2008 dengan nilai uji hitung 0,509 (nilai toleransi ± 0,509), sedangkan kualitas data SBP (diukur menggunakan t-studentized uji) mendapatkan nilai hitung sebesar -1,287 dengan toleransi ± 1,96. Artinya kualitas datanya bagus. Berdasarkan model 3d, rata-rata ketebalan lapisan secara berurutan adalah 5,84 m, 1,072 m, 0,758 m, dan 6.355 m, sedangkan total volume sedimen adalah 24.894.422,949 m3.

Perencanaan Rute dan Desain Lendutan Kabel Listrik untuk Jalur Transmisi dari PLTS Apung Kutai Lama ke Gardu Induk PLN Sambutan Samarinda Dinda Amar Pradana; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 5, No 2 (2022): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.68527

Dalam pengembangan Pembangkit Listrik Tenaga Surya (PLTS) apung yang direncanakan berada di area galian bekas tambang batubara PT. Alfa Daya Energi di Kutai Lama, diperlukan studi pembangunan berupa Pre-Feasibility Study. Salah satunya yaitu daya dukung pembangunan jaringan transmisi yang menghubungkan PLTS apung ke gardu induk terdekat yaitu GI PLN Sambutan dan desain lendutan kabel sepanjang jalur transmisi dengan menggunakan Metode Desktop Study. Pelaksanaan kegiatan ini meliputi tahapan identifikasi penutup lahan, ekstraksi Digital Terrain Model (DTM) dengan metode filtering, pemilihan rute dengan Metode Analytic Hierarchy Process (AHP), penempatan titik rencana tower transmisi, dan juga pembuatan desain lendutan. Titik rencana tower transmisi memiliki jarak gawang sebesar 300 meter, dengan memperhatikan ruang bebas dan jarak bebas lendutan kabel terhadap objek di sekitarnya ke arah vertikal dan horizontal (sesuai dengan dokumen SPLN T5.006:2019). Desain lendutan perlu memperhatikan data DTM dan DSM untuk menentukan elevasi tower, dan sudut defleksi dalam penentuan tipe tower. Hasil yang diperoleh dari kegiatan ini yaitu 3 alternatif rute transmisi dengan mempertimbangkan panjang rute, jumlah tower pendekatan berdasarkan panjang rute, akses terhadap jaringan jalan utama serta jarak terhadap kawasan permukiman. Berdasarkan pertimbangan tersebut dipilih 1 alternatif rute transmisi yaitu rute kedua yang memiliki panjang 13,5 kilometer dengan jumlah tower transmisi sebanyak 44 buah dengan masing-masing jumlah tower untuk tipe AA sebanyak 33 tower, tipe CC sebanyak 2 tower, tipe DD sebanyak 3 tower, tipe EE sebanyak 4 tower dan tipe DDR sebanyak 2 tower. Untuk desain lendutan, diperoleh nilai rasio sagging berkisar antara 0,62 sampai 1,49 dengan rata-rata rasio sebesar 0,99.

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